Wǎngshàng de hēizi zǒng xǐhuān wúyuán-wúgù de pīpíng biérén.
Online haters always like to criticize others for no reason.
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黑子 in internet slang means a 'hater' or 'detractor', someone who spreads negativity about a person or group online. This usage is colloquial and distinct from the literal meanings (chess piece / sunspot).
